If you need a black light, I have several for sale or trade. The big one is the best. It takes 4 AA batteries and can be used as a flashlight as well.

The little one is an LED. It only barely illuminates new Paulson chips, but brings out Chipcos, specifically the Luxor dollars, very well.

I have the big ones new in their original packaging for $15 shipped via Priority Mail. The LEDs I have for $10 shipped first class. Anyone interested can email me directly.